2 * (C) Copyright 2011 - 2012 Samsung Electronics
3 * EXT4 filesystem implementation in Uboot by
4 * Uma Shankar <uma.shankar@samsung.com>
5 * Manjunatha C Achar <a.manjunatha@samsung.com>
7 * ext4ls and ext4load : Based on ext2 ls and load support in Uboot.
8 * Ext4 read optimization taken from Open-Moko
12 * esd gmbh <www.esd-electronics.com>
13 * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
15 * based on code from grub2 fs/ext2.c and fs/fshelp.c by
16 * GRUB -- GRand Unified Bootloader
17 * Copyright (C) 2003, 2004 Free Software Foundation, Inc.
19 * ext4write : Based on generic ext4 protocol.
21 * SPDX-License-Identifier: GPL-2.0+
25 #include <ext_common.h>
27 #include "ext4_common.h"
29 int ext4fs_symlinknest
;
30 struct ext_filesystem ext_fs
;
32 struct ext_filesystem
*get_fs(void)
37 void ext4fs_free_node(struct ext2fs_node
*node
, struct ext2fs_node
*currroot
)
39 if ((node
!= &ext4fs_root
->diropen
) && (node
!= currroot
))
44 * Taken from openmoko-kernel mailing list: By Andy green
45 * Optimized read file API : collects and defers contiguous sector
46 * reads into one potentially more efficient larger sequential read action
48 int ext4fs_read_file(struct ext2fs_node
*node
, loff_t pos
,
49 loff_t len
, char *buf
, loff_t
*actread
)
51 struct ext_filesystem
*fs
= get_fs();
54 int log2blksz
= fs
->dev_desc
->log2blksz
;
55 int log2_fs_blocksize
= LOG2_BLOCK_SIZE(node
->data
) - log2blksz
;
56 int blocksize
= (1 << (log2_fs_blocksize
+ log2blksz
));
57 unsigned int filesize
= __le32_to_cpu(node
->inode
.size
);
58 lbaint_t previous_block_number
= -1;
59 lbaint_t delayed_start
= 0;
60 lbaint_t delayed_extent
= 0;
61 lbaint_t delayed_skipfirst
= 0;
62 lbaint_t delayed_next
= 0;
63 char *delayed_buf
= NULL
;
66 /* Adjust len so it we can't read past the end of the file. */
70 blockcnt
= ((len
+ pos
) + blocksize
- 1) / blocksize
;
72 for (i
= pos
/ blocksize
; i
< blockcnt
; i
++) {
74 int blockoff
= pos
% blocksize
;
75 int blockend
= blocksize
;
77 blknr
= read_allocated_block(&(node
->inode
), i
);
81 blknr
= blknr
<< log2_fs_blocksize
;
84 if (i
== blockcnt
- 1) {
85 blockend
= (len
+ pos
) % blocksize
;
87 /* The last portion is exactly blocksize. */
93 if (i
== pos
/ blocksize
) {
95 blockend
-= skipfirst
;
100 if (previous_block_number
!= -1) {
101 if (delayed_next
== blknr
) {
102 delayed_extent
+= blockend
;
103 delayed_next
+= blockend
>> log2blksz
;
105 status
= ext4fs_devread(delayed_start
,
111 previous_block_number
= blknr
;
112 delayed_start
= blknr
;
113 delayed_extent
= blockend
;
114 delayed_skipfirst
= skipfirst
;
116 delayed_next
= blknr
+
117 (blockend
>> log2blksz
);
120 previous_block_number
= blknr
;
121 delayed_start
= blknr
;
122 delayed_extent
= blockend
;
123 delayed_skipfirst
= skipfirst
;
125 delayed_next
= blknr
+
126 (blockend
>> log2blksz
);
129 if (previous_block_number
!= -1) {
131 status
= ext4fs_devread(delayed_start
,
137 previous_block_number
= -1;
139 memset(buf
, 0, blocksize
- skipfirst
);
141 buf
+= blocksize
- skipfirst
;
143 if (previous_block_number
!= -1) {
145 status
= ext4fs_devread(delayed_start
,
146 delayed_skipfirst
, delayed_extent
,
150 previous_block_number
= -1;
157 int ext4fs_ls(const char *dirname
)
159 struct ext2fs_node
*dirnode
;
165 status
= ext4fs_find_file(dirname
, &ext4fs_root
->diropen
, &dirnode
,
168 printf("** Can not find directory. **\n");
172 ext4fs_iterate_dir(dirnode
, NULL
, NULL
, NULL
);
173 ext4fs_free_node(dirnode
, &ext4fs_root
->diropen
);
178 int ext4fs_exists(const char *filename
)
183 ret
= ext4fs_open(filename
, &file_len
);
187 int ext4fs_size(const char *filename
, loff_t
*size
)
189 return ext4fs_open(filename
, size
);
192 int ext4fs_read(char *buf
, loff_t len
, loff_t
*actread
)
194 if (ext4fs_root
== NULL
|| ext4fs_file
== NULL
)
197 return ext4fs_read_file(ext4fs_file
, 0, len
, buf
, actread
);
200 int ext4fs_probe(block_dev_desc_t
*fs_dev_desc
,
201 disk_partition_t
*fs_partition
)
203 ext4fs_set_blk_dev(fs_dev_desc
, fs_partition
);
205 if (!ext4fs_mount(fs_partition
->size
)) {
213 int ext4_read_file(const char *filename
, void *buf
, loff_t offset
, loff_t len
,
220 printf("** Cannot support non-zero offset **\n");
224 ret
= ext4fs_open(filename
, &file_len
);
226 printf("** File not found %s **\n", filename
);
233 return ext4fs_read(buf
, len
, len_read
);
236 int ext4fs_uuid(char *uuid_str
)
238 if (ext4fs_root
== NULL
)
241 #ifdef CONFIG_LIB_UUID
242 uuid_bin_to_str((unsigned char *)ext4fs_root
->sblock
.unique_id
,
243 uuid_str
, UUID_STR_FORMAT_STD
);